Blood Bomb

You target a creature within range that has blood running through its veins. The creature must succeed on a Constitution saving throw or take 2d6 necrotic damage as its blood violently agitates. If the damage reduces the target to 0 hit points, you cause the creature to burst, and each creature within 5 feet of it must succeed on a Dexterity saving throw or take 1d6 necrotic damage.

At Higher Levels: When you cast this spell using a spell slot of 2nd level or higher, the damage of the initial burst increases by 1d6, and the damage of the secondary effect increases by 1d6 for each slot level above 1st.